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**1. Homework Statement**

A loop-the-loop machine has radius 18m. What is the minimum speed at which a cart must travel so that it will safely loop the loop?

**2. Homework Equations**

centripetal acceleration: v^2/r

velocity=(2r*pi)/t

Perhaps more?

**3. The Attempt at a Solution**

To be honest, my main problem is that I'm not really sure where to start. I calculated the displacement a cart must travel, i.e. the circumference of the diameter, but I don't know what to do next..